ynab_update_transactions

Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?

Annotations already indicate non-readOnly, non-destructive, and idempotent. The description adds behavioral context: dry-run preview, return summary (updated/failed), and the 100-item limit. This goes beyond annotations, though idempotency is hinted but not expanded.

Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.

Is the description appropriately sized, front-loaded, and free of redundancy?

The description is well-structured with a title, Args, Returns, and Examples. It is fairly concise but could be slightly more compact (e.g., merging Returns and Examples). Front-loading is good.

Shorter descriptions cost fewer tokens and are easier for agents to parse. Every sentence should earn its place.

Given the tool's complexity, does the description cover enough for an agent to succeed on first attempt?

Given the batch complexity and presence of output schema, the description covers purpose, parameters, returns, and an example. It mentions dry-run preview for first 10 items, but lacks details on error handling or partial failures beyond 'summary (updated, failed)'.

Complex tools with many parameters or behaviors need more documentation. Simple tools need less. This dimension scales expectations accordingly.

Does the description clarify parameter syntax, constraints, interactions, or defaults beyond what the schema provides?

Despite 0% schema coverage, the description fully explains all three parameters: budget_id optional for default, transactions required with id and fields, dry_run optional with default false. This compensates entirely for missing schema descriptions, providing clear semantics.

Input schemas describe structure but not intent. Descriptions should explain non-obvious parameter relationships and valid value ranges.

Does the description clearly state what the tool does and how it differs from similar tools?

The description clearly states the tool updates 1–100 transactions in a single batch with a dry-run preview. It uses specific verbs and resources ('update', 'transactions', 'batch') and distinguishes itself from siblings like ynab_update_transaction (single) and ynab_create_transactions (new).

Agents choose between tools based on descriptions. A clear purpose with a specific verb and resource helps agents select the right tool.

Does the description explain when to use this tool, when not to, or what alternatives exist?

The description implies usage for bulk updates via 'batch' and 'up to 100', and mentions dry-run for previewing. However, it lacks explicit guidance on when to choose this over alternatives (e.g., ynab_update_transaction for single) or prerequisites like budget existence.

Agents often have multiple tools that could apply. Explicit usage guidance like "use X instead of Y when Z" prevents misuse.